Chen Shulin, Ding Chen, Lin Yong, Wu Xinzhou, Yuan Wei, Meng Xiuqing, Su Wenming, Zhang Ke-Qin
Zhejiang Provincial Key Laboratory of Solid State Optoelectronic Devices, Zhejiang Normal University Jinhua 321004 China
Printable Electronics Research Centre, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences Suzhou 215123 China
RSC Adv. 2020 Jun 8;10(37):21845-21851. doi: 10.1039/d0ra01454k.
Here we demonstrate a novel SERS-active substrate assembled by silver nanowire (Ag NW)-embedded porous polystyrene (PS) fibers. Ag NWs are synthesized through a glycerol-mediated solvothermal method firstly, then electrospun into PS porous fibers. The as-synthesized Ag NWs are embedded in PS fiber and aligned orderly along the axial direction. Porous structure appears in PS fiber due to the phase separation induced by rapid evaporation of solvents. Large amounts of holes not only greatly improve the sample collection efficiency of the SERS-active substrate, but also significantly facilitate the adsorption of target molecules on the surface of Ag NWs, thus increasing the probability of enhancement of target molecules. In addition, compared with polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP), PS has better solvent resistance. The detection limit of 4-aminothiophenol (4-ATP) on our fabricated electrospun fiber mats is 10 M, and the electrospun fiber mats showed good reproducibility of SERS signal detection. This study proposes a feasible strategy for the large-scale preparation of flexible SERS-active substrate assembled by Ag NW-embedded porous PS fibers. The produced flexible SERS substrates may have potential application in wearable sensors for the trace detection of chemical and biological molecules.
在此，我们展示了一种由嵌入银纳米线（Ag NW）的多孔聚苯乙烯（PS）纤维组装而成的新型表面增强拉曼散射（SERS）活性基底。首先通过甘油介导的溶剂热法合成Ag NWs，然后将其电纺成PS多孔纤维。合成的Ag NWs嵌入PS纤维中并沿轴向有序排列。由于溶剂快速蒸发引起的相分离，PS纤维中出现了多孔结构。大量的孔洞不仅极大地提高了SERS活性基底的样品收集效率，还显著促进了目标分子在Ag NWs表面的吸附，从而增加了目标分子增强的概率。此外，与聚乙烯醇（PVA）和聚乙烯吡咯烷酮（PVP）相比，PS具有更好的耐溶剂性。我们制备的电纺纤维垫对4-氨基硫酚（4-ATP）的检测限为10 M，并且电纺纤维垫显示出良好的SERS信号检测重现性。本研究提出了一种大规模制备由嵌入Ag NW的多孔PS纤维组装而成的柔性SERS活性基底的可行策略。所制备的柔性SERS基底在用于化学和生物分子痕量检测的可穿戴传感器中可能具有潜在应用。
